ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV - Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Asilar, E; Bergauer, T; Brandstetter, J; Brondolin, E; Dragicevic, M; Erö, J; Fabjan, C; Flechl, M; et al. (Physics Letters B, 2016)